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It's understood a Polish teenager stabbed to death outside Finsbury Park Tube station was killed as he tried to protect his girlfriend who was attacked on a bus.
Marcin Bilaszewski died after a row with another man on the number 254 bus on Saturday night.
The 19 year old died in hospital after being attacked in Seven Sisters Road.
It comes as Prince Charles is to attend a "service of peace" at Westminster Cathedral dedicated to the memory of teenage victims of violent crime.
It's being organised by the parents of Jimmy Mizen - the 16 year old was killed at a bakery in south east London exactly two years ago.